/*
 * Copyright 2015-2018 Igor Maznitsa.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.igormaznitsa.mindmap.model;

import java.io.File;
import java.util.Locale;
import java.util.regex.Pattern;

public class ExtraTopic extends Extra<String> {
    public static final String TOPIC_UID_ATTR = "topicLinkUID"; 
    private final String topicUID;

    public ExtraTopic(String topicUID) {
        this.topicUID = topicUID;
    }


    public static <T extends Topic<T>> ExtraTopic makeLinkTo(MindMap<T> map, T topic) {
        ExtraTopic result = null;
        if (topic != null) {
            String uid = topic.getAttribute(TOPIC_UID_ATTR);
            if (uid == null) {
                String time = Long.toHexString(System.currentTimeMillis() & 0x7FFFFFFFFFFFFFFFL)
                        .toUpperCase(Locale.ENGLISH);
                char extra = 'A';
                while (true) {
                    uid = time + extra;
                    if (map.findTopicForLink(new ExtraTopic(uid)) != null) {
                        if (extra == 'Z') {
                            time = Long.toHexString(System.nanoTime() & 0x7FFFFFFFFFFFFFFFL)
                                    .toUpperCase(Locale.ENGLISH);
                            extra = 'A';
                        }
                        else {
                            extra++;
                        }
                    }
                    else {
                        break;
                    }
                }
                topic.setAttribute(TOPIC_UID_ATTR, uid);
            }
            result = new ExtraTopic(uid);
        }
        return result;
    }

    @Override
    public int hashCode() {
        return this.topicUID.hashCode();
    }

    @Override
    public boolean equals(Object that) {
        if (that == null) {
            return false;
        }
        if (this == that) {
            return true;
        }
        if (that instanceof ExtraTopic) {
            return this.topicUID.equals(((ExtraTopic) that).topicUID);
        }
        else {
            return false;
        }
    }

    @Override
    public boolean containsPattern(File baseFolder, Pattern pattern) {
        return false;
    }

    @Override
    public String getValue() {
        return this.topicUID;
    }

    @Override
    public ExtraType getType() {
        return ExtraType.TOPIC;
    }

    @Override
    public String getAsString() {
        return this.topicUID;
    }

    @Override
    public String provideAsStringForSave() {
        return this.getAsString();
    }
}
